A method for transferring data between a storage and playback device and a server containing at least one audio file having information for producing a tempo that is sensible to at least one user as the at least one user performs a repetitive motion activity, the storage and playback device being capable of storing and playing the information in the audio file, the method comprising, at the data storage and playback device, or at a combination of the server and the data storage and playback device: receiving a request to substantially match at least one audio file based on its beats per minute for outputting on the storage and payback device; identifying a metadata tempo tag for each designated audio file, each tempo tag indicating the tempo of the audio file; and causing to be delivered to, or providing to, the storage and playback device the audio file.